I was asked by a local library to make some B&W prints from their color negatives a couple of years ago. I used MG and grade 4 or so filtration and that worked out OK. It wasn't great art, but great art wasn't what they wanted anyway. They were happy with the result.

A lot depends on the negs and what you're looking to achieve. In my case, the subject was their library, and it is a white painted frame building, so color rendition wasn't much of a factor.